atkelar | HP 1600A Logic Analyzer 1/2 @atkelar | Uploaded June 2023 | Updated October 2024, 3 hours ago.
Workshop Project #24 - HP 1600A
The HP 1600A was certainly amongst the first, if not the first, logic state analyzers. With the digital circuits getting more and more common around that time, workshops needed tools to identify problems and diagnose glitches; especially since the CPUs were reaching the MHz range and a "capture" mode for signal tracing was a must.
HP took the case and CRT part of an established oscilloscope and added the digital components to the CRT section.
I really like these devices that transition from one technology to the next. Where else do you see TTL interfacing with a native CRT device in such a direct manner? The "character" generation is a simple sine wave: apply in Y only to get a "1" and apply a phase shifted (cosine) version to X to get a "0". Besides simple dots, that's all the thing can put on display! And it's enouhg for quite a few diagnostic tasks!
...if it works, that is! Join in for part one of two, where I start to disassemble it and start the cleanup process. Part two will show the rebuild, as well as some troubleshooting!
0:00 Intro / Overview / Peek Inside
2:39 First Steps of Disassembly
3:55 Finally, First Board: CRT controller
4:40 Main PCB + Botches, "Backplane" PCB
5:51 Front Panel + CRT
7:19 Power Supply / Mains Transformer + Filter Caps
8:38 Heat Sink / Power Supply PCB
9:47 Back Panel / Mains Wiring
10:38 Voltage Selection / Rectifier / Transformer
11:40 HV Suppoly PCB / LED Clips / Final Case Parts and more Rust
13:07 Rust Removal Mains Transformer / Switches Disassembly / Solder Issue
15:04 HV Potentiometer / Pot and Swtich Info
16:45 Mains Swtich
18:01 Trigger Switches / Delay Encoders
19:54 Recapping! / IC Pins / Probe Sockets
20:44 Switch Assembly
22:33 Summary / Outtake
Music:
My Train's A Comin'
Unicorn Heads
(YouTube Audio Library)
You can support me on Ko-Fi: ko-fi.com/atkelar
Workshop Project #24 - HP 1600A
The HP 1600A was certainly amongst the first, if not the first, logic state analyzers. With the digital circuits getting more and more common around that time, workshops needed tools to identify problems and diagnose glitches; especially since the CPUs were reaching the MHz range and a "capture" mode for signal tracing was a must.
HP took the case and CRT part of an established oscilloscope and added the digital components to the CRT section.
I really like these devices that transition from one technology to the next. Where else do you see TTL interfacing with a native CRT device in such a direct manner? The "character" generation is a simple sine wave: apply in Y only to get a "1" and apply a phase shifted (cosine) version to X to get a "0". Besides simple dots, that's all the thing can put on display! And it's enouhg for quite a few diagnostic tasks!
...if it works, that is! Join in for part one of two, where I start to disassemble it and start the cleanup process. Part two will show the rebuild, as well as some troubleshooting!
0:00 Intro / Overview / Peek Inside
2:39 First Steps of Disassembly
3:55 Finally, First Board: CRT controller
4:40 Main PCB + Botches, "Backplane" PCB
5:51 Front Panel + CRT
7:19 Power Supply / Mains Transformer + Filter Caps
8:38 Heat Sink / Power Supply PCB
9:47 Back Panel / Mains Wiring
10:38 Voltage Selection / Rectifier / Transformer
11:40 HV Suppoly PCB / LED Clips / Final Case Parts and more Rust
13:07 Rust Removal Mains Transformer / Switches Disassembly / Solder Issue
15:04 HV Potentiometer / Pot and Swtich Info
16:45 Mains Swtich
18:01 Trigger Switches / Delay Encoders
19:54 Recapping! / IC Pins / Probe Sockets
20:44 Switch Assembly
22:33 Summary / Outtake
Music:
My Train's A Comin'
Unicorn Heads
(YouTube Audio Library)
You can support me on Ko-Fi: ko-fi.com/atkelar
